Bicycle hub outer and bicycle hub

Abstract

A rear hub has a hub shaft and a hub outer that is configured to be mounted in a freely rotatable manner to the hub shaft. The hub outer has an outer main body and an adapter. The outer main body is arranged on the radially inward side of a sprocket, and has a first rotation preventing section that engages with an engaging section 64 of the sprocket in such a manner that the outer main body cannot rotate relative to the sprocket. The adapter is mounted in a freely rotatable manner on an adapter mounting section of the outer main body. The adapter includes a second rotation preventing section that engages with the engaging section of the sprocket in such a manner that the adapter cannot rotate relative to the sprocket.

1. A bicycle hub freewheel assembly configured to be mounted in a freely rotatable manner to a hub shaft of a bicycle hub, comprising:
 a cylindrical outer main body including a first outer radially facing portion having a first rotation preventing section configured to radially engage an inner radially facing part of at least one first sprocket such that the outer main body cannot rotate relative to the at least one first sprocket, the cylindrical outer main body also including a second outer radially facing portion; and 
 a cylindrical adapter mounted in a freely rotatable manner on the second outer radially facing portion of the outer main body, the adapter including a second rotation preventing section configured to radially engage an inner radially facing part of at least one second sprocket such that the adapter cannot rotate relative to the at least one second sprocket. 
 
   
   
     2. The bicycle hub freewheel assembly as recited in  claim 1 , wherein
 the outer main body and the adapter are constructed of different materials. 
 
   
   
     3. The bicycle hub freewheel assembly as recited in  claim 2 , wherein
 the first and second rotation preventing sections have a generally identical diametric cross sectional shape that are arranged closely adjacent to each other in an axial direction, and that are prevented from rotating relative to each other by engaging simultaneously with one of the first and second sprockets. 
 
   
   
     4. The bicycle hub freewheel assembly as recited in  claim 1 , wherein
 the first and second rotation preventing sections have a generally identical diametric cross sectional shape that are arranged closely adjacent to each other in an axial direction, and that are prevented from rotating relative to each other by engaging simultaneously with one of the first and second sprockets. 
 
   
   
     5. The bicycle hub freewheel assembly as recited in  claim 4 , wherein
 the adapter is press fitted onto an outer radially facing portion of the outer main body. 
 
   
   
     6. A bicycle hub freewheel assembly configured to be mounted in a freely rotatable manner to a hub shaft of a bicycle hub, comprising:
 a cylindrical outer main body including a first outer radially facing portion configured to radially engage an inner radially facing part of at least one first sprocket and a second outer radially facing portion, the first and second outer radially facing portions being formed as a single unitary element; and 
 a cylindrical adapter constructed of a different material than the outer main body, and including an inner engaging section having an inner radially facing surface engaging an outer surface of the second outer radially facing portion of the outer main body such that the adapter cannot rotate relative to the outer main body. 
 
   
   
     7. The bicycle hub freewheel assembly as recited in  claim 6 , wherein
 the adapter includes a first rotation preventing section that engages an inner radially facing part of at least one second sprocket such that the adapter cannot rotate relative to the at least one second sprocket. 
 
   
   
     8. The bicycle hub freewheel assembly as recited in  claim 7 , wherein
 the outer main body includes a second rotation preventing section that engages the inner radially facing part of the at least one first sprocket such that the outer main body cannot rotate relative to the at least one first sprocket; and 
 the first and second rotation preventing sections have generally an identical diametric cross sectional shape that are arranged closely adjacent to each other in an axial direction. 
 
   
   
     9. The bicycle hub freewheel assembly as recited in  claim 7 , wherein
 the adapter is press fitted onto the second outer radially facing portion of the outer main body. 
 
   
   
     10. The bicycle hub freewheel assembly as recited in  claim 6 , wherein
 the adapter is press fitted onto the second outer radially facing portion of the outer main body. 
 
   
   
     11. A bicycle hub comprising:
 a hub shaft; 
 a bicycle hub freewheel assembly mounted to rotate freely about the hub shaft; and 
 a hub shell arranged closely adjacent to the bicycle hub outer in an axial direction and mounted to rotate freely about the hub shaft, 
 the hub freewheel assembly including
 a cylindrical outer main body including a first outer radially facing portion having a first rotation preventing section configured to radially engage an inner radially facing part of at least one first sprocket such that the outer main body cannot rotate relative to the at least one first sprocket, the cylindrical outer main body also including a second outer radially facing portion, and 
 a cylindrical adapter mounted in a freely rotatable manner on the second outer radially facing portion of the outer main body, the adapter including a second rotation preventing section configured to radially engage an inner radially facing part of at least one second sprocket such that the adapter cannot rotate relative to the at least one second sprocket. 
 
 
   
   
     12. The bicycle hub as recited in  claim 11 , wherein
 the outer main body and the adapter are constructed of different materials. 
 
   
   
     13. The bicycle hub as recited in  claim 12 , wherein
 the first and second rotation preventing sections have a generally identical diametric cross sectional shape that are arranged closely adjacent to each other in an axial direction, and that are prevented from rotating relative to each other by engaging simultaneously with one of the first and second sprockets. 
 
   
   
     14. The bicycle hub as recited in  claim 11 , wherein
 the first and second rotation preventing sections have a generally identical diametric cross sectional shape that are arranged closely adjacent to each other in an axial direction, and that are prevented from rotating relative to each other by engaging simultaneously with one of the first and second sprockets. 
 
   
   
     15. The bicycle hub as recited in  claim 14 , wherein
 the adapter is press fined onto the second outer radially facing portion of the outer main body. 
 
   
   
     16. A bicycle hub comprising:
 a hub shaft; 
 a bicycle hub freewheel assembly mounted to rotate freely about the hub shaft; and 
 a hub shell arranged closely adjacent to the bicycle hub freewheel assembly in an axial direction and mounted to rotate freely about the hub shaft, 
 the hub freewheel assembly including
 a cylindrical outer main body including a first outer radially facing portion configured to radially engage an inner radially facing part of at least one first sprocket and a second outer radially facing portion, the first and second outer radially facing portions formed as a single unitary element, and 
 a cylindrical adapter constructed of a different material than the outer main body, and including an inner engaging section having an inner radially facing surface engaging an outer surface of the second outer radially facing portion of the outer main body such that the adapter cannot rotate relative to the outer main body. 
 
 
   
   
     17. The bicycle hub as recited in  claim 16 , wherein
 the adapter includes a first rotation preventing section that engages an inner radially facing part of at least one second sprocket such that the adapter cannot rotate relative to the at least one second sprocket. 
 
   
   
     18. The bicycle hub as recited in  claim 17 , wherein
 the outer main body includes a second rotation preventing section that engages the inner radially facing part of the at least one first sprocket such that the outer main body cannot rotate relative to the at least one first sprocket; and 
 the first and second rotation preventing sections have generally an identical diametric cross sectional shape that are arranged closely adjacent to each other in an axial direction. 
 
   
   
     19. The bicycle hub as recited in  claim 17 , wherein
 the adapter is press fitted onto the second outer radially facing portion of the outer main body. 
 
   
   
     20. The bicycle hub as recited in  claim 16 , wherein
 the adapter is press fitted onto the second outer radially facing portion of the outer main body.